Only zones with wildcards affected on authoritative servers (Was: Important: A significant flaw is present in June BIND releases 9.16.17 and 9.17.14)

Ondřej Surý ondrej at
Fri Jun 18 07:03:02 UTC 2021


let me add more details to the issue.

# Who’s affected

Authoritative server operators operating zones with wildcard records (f.e. *

# What’s affected

Queries hitting the wildcard records with capital `W`

# How to test?

dig IN A @

You need to adjust this to match your zone name, server IP address and the rrclass and rrtype of the wildcard record.

# Is there a hotfix?

The patch to fix this issue is available at:

# Are the ISC packages affected?

The packages with the hotfix applied were pushed into the repository and are either already built
or are building and will be available shortly

# When there will be official upstream release fixing this?

We are working on preparing the release tarball as of this moment and the fixed tarballs will be published as soon as they are ready.

Sorry for any inconvenience this might have caused, we wish we would have caught this during our extensive testing, but alas we didn’t.

Ondřej Surý (He/Him)
ondrej at

> On 18. 6. 2021, at 5:56, Michael McNally <mcnally at> wrote:
> Dear BIND users:
> Yesterday, 16 June 2021, we released monthly maintenance snapshot releases of
> our currently supported release branches of BIND.
> Specifically, we released BIND 9.11.33, 9.16.17, and 9.17.14
> There's no way to say this that isn't embarrassing, but only after the release
> was an error in a recently optimized routine discovered by a user -- an error
> that will definitely cause operational problems for almost all server operators
> who upgrade to either of these affected versions:
> -  BIND 9.16.17
> -  BIND 9.17.14
> BIND 9.11.33 is NOT affected.
> If you have not yet updated to the 16 June releases, we ask that you hold off
> on any plans to install 9.16.17 or 9.17.14 until replacement releases can be
> prepared and tested.
> The specific issue in question is being tracked in our issue tracker:
> and more information about our plans for issuing replacement releases will be
> provided later; at the moment our priority is getting the news to parties as
> quickly as possible so that those who have not already adopted the new releases
> can postpone until corrected versions are available.
> Michael McNally
> Internet Systems Consortium
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